Dynamic Mechanical Characteristics Study Of Anti-slide Piles Based On Skipping Excavation Method

The anti-slide pile has been widely used in the slope engineering for its advantages such as flexibility,convenience and remarkable effect.And the rationality of the anti-slide pile construction sequence is important for the stability of the slope during the construction process.The method of skipping excavation is often used according to engineering experience.However,the research on the dynamic mechanical characteristics of anti-slide piles during the construction of the skipping excavation is relatively lacking at presen,which leads to the practical application of the method of skipping excavation leading the related mechanism research.Therefore,it is of great significance to study the dynamic mechanical characteristics of anti-slide piles during the skipping eacavation process.Firstly,the thesis has studied the dynamic mechanical characteristics of anti-slide piles when using the skipping excavation method through the indoor model test.Secondly,the results obtained from laboratory experiments are verified by numerical simulation analysis.Finally,a simulation analysis of a highway slope support project is carried out when the method of jumping construction is adopted.The thesis draw some conclusions with certain theoretical significance and practical value of the project,which are summarized as follows:(1)Through the indoor experiment,the variation of slope displacement,the distribution of internal force of anti-slide pile and the displacement of pile top with time are studied.The results show that all three show a step-like growth trend,where the growth segment and the stationary segment alternate;(2)By comparison with the control group test full-section excavation process,it's found that the slope displacement increased sharply after about half of the excavation due to failure to obtain timely support,and then the damage occurrs.It is concluded that the safety of the skipping method is greater than that of the full-section excavation method;(3)The ABAQUS numerical analysis software is used to simulate the indoor experiment.The results show that the slope displacement,pile top displacement and internal force distribution of the pile are basically consistent with the experimental rules,that is,the steps of the growth section and the stationary section appear alternately.(4)A three-dimensional numerical simulation analysis of a road slope support project is carried out when using skipping excavation method.The results show that the excavation of the pile holes and the cutting of the soil before the piles is the main factors which lead to the increase of the internal force of the anti-slide pile,the displacement of the pile top and the displacement of the slope.